As Partial Discharge testing has evolved, so have the
methods and equipment used to perform the testing.
One common challenge many facilities encounter is
equipment which is hard to access or deemed unsafe
to open while energized. Emerson can address this
problem by permanently mounting sensors on the
equipment. Low voltage coax cable leads from
these permanent sensors (high frequency current
transformers, or HFCTs) are brought out to ports at
convenient locations where they can be
easily accessed. We can then use these ports to
periodically monitor your system and gain access
to the permanently mounted (PM) sensors without
exposing people or equipment.
Protecting Critical Assets
Online Partial Discharge (OLPD) Testing is one of the
best solutions for identifying partial discharge (PD)
throughout the Medium Voltage Distribution system.
It is performed while the equipment is energized
at normal operating voltages, under real operating
conditions, typical temperature, voltage stresses,
and vibration levels. It is a nondestructive test and
does not use over voltages that could adversely affect
the equipment. OLPD Testing is relatively inexpensive
compared to offline testing that requires interruption
of service and production. For critical facilities that
operate 24x7, OLPD is one of the best solutions for
identifying partial discharge.
Benefits
•Safer, more efficient periodic testing — saving
time and money
•Test results can be obtained without exposing
workers to potentially dangerous energized
equipment
•Elimination of test technicians suiting up and
opening panels
•Once installed, all future testing is done online
eliminating the need for costly shutdowns
PERMANENTLY MOUNTED SENSORS
Permanently Mounted
Sensors Collect Data
Without Exposing Workers
To Potentially Dangerous
Energized Equipment
Liebert Services
PERMANENTLY MOUNTED SENSORS
Utilizing the PM sensors increases safety and provides
an economic payback as a result of improved efficiencies
during testing. Data can be collected from the enclosure
during normal operation without exposure to energized
conductors or the need for special personal protective
equipment (PPE) or a second field engineer required for
safety and/or removal of covers. For sites with numerous
PM sensors, this can be a significant cost savings compared
to the typical cost for cover removal and placement of
temporary sensors.
Installation
The best time for installation is during a plant outage or
scheduled plant downtime. For a new facility installation
would take place during the construction and installation
of the electrical system. Setup is relatively non-destructive
and consists of drilling two holes into the switchgear/cable
box enclosure for mounting while tie-wraps are used to
secure the coax cable.
The overall size of the sensor is minimal and once
installed, no further outage or disruptions are required
for online testing.
Benefits
The advantages for installing permanently mounted
sensors include:
• Safer, more efficient periodic testing — saving time
and money
• Test results can be obtained without exposing workers
to potentially dangerous energized equipment
• Elimination of test technicians suiting up and
opening panels
• Once installed, all future testing is done online
eliminating the need for costly shutdowns
Trust the Experts
Partial discharge testing plays a critical role in determining
the health of your electrical assets and ensuring maximum
uptime. It also provides asset managers with the critical
information to target maintenance resources to the areas
that require the most attention. Depending on your specific
operating requirements and application, Emerson can
help you develop and implement the right combination
of technologies to meet your maintenance requirements.
Improve operational efficiency and worker safety by working
with the experts at Emerson.
Features
Other features of these sensor installations include:
• Insulated & waterproof
• Wide frequency detection range (100kHz to 25MHz)
• Suitable for online PD detection in medium and high
voltage cable systems, switchgear and transformers
Ordering Information
To learn more about this service
and other Emerson Network Power
solutions, please contact your local
Liebert Services sales representative
office or visit us on the web at:
www.emersonnetworkpower.com
In the U.S., call 1-800-543-2378
Emerson — Your Partner in Reliability
From installation to operation, only Emerson has the
knowledge and experience to seamlessly integrate all the
essential services to deliver “high nines” reliability required
by today’s critical facilities. Look to us as your partner.
We’ll be with you every step of the way with the right
combination of technology, people, and services. Contact
Emerson to realize the true potential of your assets.
EmersonNetworkPower.com
800-LIEBERT (543-2378)
CS-00168
Emerson Network Power, Liebert Services and the Emerson Network Power logo are
trademarks and service marks of Emerson Electric Co. All other trademarks are the
property of their respective owners. ©2011 Emerson Electric Co.
Liebert Services
THE LIEBERT SERVICES CRITICAL DIFFERENCE
FOR PERMANENTLY MOUNTED SENSORS